Grinding device



Jan. 2, 1934.

H. G. EVANS GRINDING DEVICE Filed March 2, 1932 di /A4221- H15 A TTORNEY.

Patented Jan. 2, 1934 barren starts.

j I A 1,941,971

1,941,977 GRINDING DEVICE j Herbert G. Evans, Sherbrooke, Quebec, Canada, assignor to Ingersoll-Rand Company, Jersey City, N. 3., a corporation of New- Jersey Application March. 2, 1932.: Serial No. 596,202,

2 Claims.

This invention relates to grinding devices, but more particularly to portable. grinding devices adapted to be secured to the work in order to assure the correct operative position of the grinding wheel with respect tothework.

One object of the invention is to facilitate the operation of grinding the end surfaces of articles, as for instance drill steels which, because of their length and consequent flexibility, ofier considerable difficulty in the matter of disposing and maintaining them in the correct position for operation thereon of a grinding wheel mounted upon a fixed support.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawing accompanying this specification and in which similar reference characters refer to similar parts,

Figure 1 is a longitudinal elevation partly in section of a grinding device constructed in accordance with the practice of the invention and showing it applied to a working implement to grind the end face thereof, and

Figure 2 is a transverse View taken through Figure 1 on the line 2-2 looking in the direction indicated by the arrows.

Referring more particularly to the drawing, A designates, in general, the grinding device which comprises a support B having a concave recess 0 in one end thereof to locate the work, as for instance the shank D of a drill steel E, with respect to the support.

On opposite sides of the support and forming integral parts thereof are wings F which serve as seats for a plate G secured to the wings F by means of bolts H. In the side plate G which seats against the wings F is a recess J to assure ample clearance between the shank D and the plate, and the plate is provided with a threaded aperture K for the accommodation of a locking screw L which bears against the shank D to clamp the support B thereto.

In the opposite end of the support B is a bore 0 lying in parallelism with the recess C to accommodate a bushing P which serves as a bearing surface for a rod or arm Q disposed rotatably within the bushing P. On the end of the rod Q is a shoulder R to seat against the end of the bushing P and the side of the support B for the holding the rod against longitudinal movement in one direction.

Disposed slidably on the rod Q and near the opposite end thereof is a bracket S which may be interlocked with the rod against relative rotation as by means of a key T seated in the rod and engaging a key slot U in the bracket S. The bracket S extends laterally of the arm Q and" serves-as a support for a motor V which maybe secured to the bracket by bolts 'W. The motor V may beof a well known type adapted to be actuated by pressure fluid which may be supplied to the motor through a hose X connected to the handle Y of the motor.

On the shaft Z of the motor is a grinding wheel b which may be secured to the shaft Z in a well known manner.

The bracket S is so proportioned that in the assembled positions of the parts the longitudinal axis of the motor may be brought into coincidence with or rocked through the longitudinal axis of the drill steel E to grind the end surface 0 of the shank D or such other element to which the support B may be clamped.

Convenient means are provided for actuating the motor V and the grinding wheel b in the direction of the work and to form an abutment for the bracket S. To this end the rod Q is provided with a threaded extension d for the accommodation of a wing nut e. Interposed between the wing nut e and the bracket S is a spacer ;f in the form of a sleeve, the interior g of which is of such diameter as to permit the sleeve to pass readily over the rod Q. At the end of the spacer j adjacent the wing nut e is an introverted flange it having a bore 1' therein through which the threaded extension d extends. The bore a is preferably a sliding fit on the extension (1 to assist in maintaining the spacer f in appropriate coaxial alignment with the rod Q. In order to maintain the bracket S seated firmly against the spacer ;f a spring Q may be disposed about the rod Q to seat with one end against the bracket S and with its other end against the support B.

If desired, the support B may be provided with a pair of wings it having apertures o for the reception of bolts whereby the grinding device may be afllxed to a convenient base or support.

In practice, the device is disposed on the shank D of the drill steel E and clamped thereto by means of the screw L in such wise that the surface or surfaces of the concave recess C will be brought into body contact with the surface of the shank D. The motor V is then set in operation and is oscillated, by means of the handle Y, about the axis of the arm Q to carry the grinding wheel I) to and fro across the end surface 0 of the shank D.

Whenever it is desired to increase the pressure of the grinding wheel 1) against the end of the shank D the wing nut e may be rotated on the extension (1 and the motor and the grinding wheel will, in this way, be gradually actuated in the direction of the work to assure the required pressure of the grinding wheel thereagainst. The bracket S will, of course, be held firmly against the abutment or spacer f by the spring Q and the correct position of the grinding wheel b with respect to the work will thus be assured.

In actual practice the present invention has been found to be highly eilicient as a means for grinding end surfaces of the shanks of drill steels, particularly drill steels of considerable length and which, because of that fact, are extremely flexible and are therefore difficult to support in the correct operative relationship with respect to a grinding wheel support by a fixed base or pedestal. As will be readily apparent, a device constructed according to the invention may be expeditiously clamped and accurately located on the comparatively rigid shank of the drill steel, and the grinding element will, therefore, be conveniently brought into and maintained in the correct operative position with respect to the surface 0 of the shank D, irrespective of the degree of sag or curvature of the main body portion of the drill steel.

I claim:

1. A grinding device, comprising a support having a work receiving aperture, means for securing the support to the work, a motor, a grinding wheel attached thereto, an arm freely rotatable with one end in the support, and a bracket slidably interlocked with the arm and being connected to the motor to maintain the grinding wheel in coaxial alignment with the aperture.

2. A grinding device, comprising a support, having. a work receiving aperture, means for securing the support to the work, a motor, a grinding wheel attached thereto, an arm rotatable in the support, a bracket rotatable with and slidable on the arm and being secured to the motor to hold the grinding wheel adjacent one end of the aperture, and a spring on the arm acting against the support and the bracket to resist movement of the motor and the grinding wheel toward the support.

HERBERT GEO. EVANS. 

